Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..387h&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
In 2001 we discovered the presence of the secondary minimum in the binary system YY Her that was however indicated only by three photometric observations from one observatory. This uncertainty stimulated us to activate an international photometric campaign for a detailed coverage of the light curve during the period of the expected secondary minimum. The campaign was very successful; it covered also the primary minimum and brought a large amount of interesting results that are the subject of this work. We explain the periodic variations of the brightness of YY Her by the eclipses of the components in the symbiotic system. The model with a deformed (non-homogeneous) envelope, surrounding the white dwarf is discussed. In addition, we observed a flare in about JD 2452440, during the primary minimum that was later followed by an energetic outburst in about JD 2452700. The energetic balances of the afore-mentioned events are calculated.
Galis Rudolf
Hric Ladislav
Smelcer Ladislav
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